diff options
Diffstat (limited to 'src/opus-1.0.2/silk/resampler.c')
| -rw-r--r-- | src/opus-1.0.2/silk/resampler.c | 215 |
1 files changed, 0 insertions, 215 deletions
diff --git a/src/opus-1.0.2/silk/resampler.c b/src/opus-1.0.2/silk/resampler.c deleted file mode 100644 index 7e58332f..00000000 --- a/src/opus-1.0.2/silk/resampler.c +++ /dev/null @@ -1,215 +0,0 @@ -/*********************************************************************** -Copyright (c) 2006-2011, Skype Limited. All rights reserved. -Redistribution and use in source and binary forms, with or without -modification, are permitted provided that the following conditions -are met: -- Redistributions of source code must retain the above copyright notice, -this list of conditions and the following disclaimer. -- Redistributions in binary form must reproduce the above copyright -notice, this list of conditions and the following disclaimer in the -documentation and/or other materials provided with the distribution. -- Neither the name of Internet Society, IETF or IETF Trust, nor the -names of specific contributors, may be used to endorse or promote -products derived from this software without specific prior written -permission. -THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS “AS IS” -AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE -IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE -ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE -LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR -CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF -SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS -INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN -CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) -ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE -POSSIBILITY OF SUCH DAMAGE. -***********************************************************************/ - -#ifdef HAVE_CONFIG_H -#include "config.h" -#endif - -/* - * Matrix of resampling methods used: - * Fs_out (kHz) - * 8 12 16 24 48 - * - * 8 C UF U UF UF - * 12 AF C UF U UF - * Fs_in (kHz) 16 D AF C UF UF - * 24 AF D AF C U - * 48 AF AF AF D C - * - * C -> Copy (no resampling) - * D -> Allpass-based 2x downsampling - * U -> Allpass-based 2x upsampling - * UF -> Allpass-based 2x upsampling followed by FIR interpolation - * AF -> AR2 filter followed by FIR interpolation - */ - -#include "resampler_private.h" - -/* Tables with delay compensation values to equalize total delay for different modes */ -static const opus_int8 delay_matrix_enc[ 5 ][ 3 ] = { -/* in \ out 8 12 16 */ -/* 8 */ { 6, 0, 3 }, -/* 12 */ { 0, 7, 3 }, -/* 16 */ { 0, 1, 10 }, -/* 24 */ { 0, 2, 6 }, -/* 48 */ { 18, 10, 12 } -}; - -static const opus_int8 delay_matrix_dec[ 3 ][ 5 ] = { -/* in \ out 8 12 16 24 48 */ -/* 8 */ { 4, 0, 2, 0, 0 }, -/* 12 */ { 0, 9, 4, 7, 4 }, -/* 16 */ { 0, 3, 12, 7, 7 } -}; - -/* Simple way to make [8000, 12000, 16000, 24000, 48000] to [0, 1, 2, 3, 4] */ -#define rateID(R) ( ( ( ((R)>>12) - ((R)>16000) ) >> ((R)>24000) ) - 1 ) - -#define USE_silk_resampler_copy (0) -#define USE_silk_resampler_private_up2_HQ_wrapper (1) -#define USE_silk_resampler_private_IIR_FIR (2) -#define USE_silk_resampler_private_down_FIR (3) - -/* Initialize/reset the resampler state for a given pair of input/output sampling rates */ -opus_int silk_resampler_init( - silk_resampler_state_struct *S, /* I/O Resampler state */ - opus_int32 Fs_Hz_in, /* I Input sampling rate (Hz) */ - opus_int32 Fs_Hz_out, /* I Output sampling rate (Hz) */ - opus_int forEnc /* I If 1: encoder; if 0: decoder */ -) -{ - opus_int up2x; - - /* Clear state */ - silk_memset( S, 0, sizeof( silk_resampler_state_struct ) ); - - /* Input checking */ - if( forEnc ) { - if( ( Fs_Hz_in != 8000 && Fs_Hz_in != 12000 && Fs_Hz_in != 16000 && Fs_Hz_in != 24000 && Fs_Hz_in != 48000 ) || - ( Fs_Hz_out != 8000 && Fs_Hz_out != 12000 && Fs_Hz_out != 16000 ) ) { - silk_assert( 0 ); - return -1; - } - S->inputDelay = delay_matrix_enc[ rateID( Fs_Hz_in ) ][ rateID( Fs_Hz_out ) ]; - } else { - if( ( Fs_Hz_in != 8000 && Fs_Hz_in != 12000 && Fs_Hz_in != 16000 ) || - ( Fs_Hz_out != 8000 && Fs_Hz_out != 12000 && Fs_Hz_out != 16000 && Fs_Hz_out != 24000 && Fs_Hz_out != 48000 ) ) { - silk_assert( 0 ); - return -1; - } - S->inputDelay = delay_matrix_dec[ rateID( Fs_Hz_in ) ][ rateID( Fs_Hz_out ) ]; - } - - S->Fs_in_kHz = silk_DIV32_16( Fs_Hz_in, 1000 ); - S->Fs_out_kHz = silk_DIV32_16( Fs_Hz_out, 1000 ); - - /* Number of samples processed per batch */ - S->batchSize = S->Fs_in_kHz * RESAMPLER_MAX_BATCH_SIZE_MS; - - /* Find resampler with the right sampling ratio */ - up2x = 0; - if( Fs_Hz_out > Fs_Hz_in ) { - /* Upsample */ - if( Fs_Hz_out == silk_MUL( Fs_Hz_in, 2 ) ) { /* Fs_out : Fs_in = 2 : 1 */ - /* Special case: directly use 2x upsampler */ - S->resampler_function = USE_silk_resampler_private_up2_HQ_wrapper; - } else { - /* Default resampler */ - S->resampler_function = USE_silk_resampler_private_IIR_FIR; - up2x = 1; - } - } else if ( Fs_Hz_out < Fs_Hz_in ) { - /* Downsample */ - S->resampler_function = USE_silk_resampler_private_down_FIR; - if( silk_MUL( Fs_Hz_out, 4 ) == silk_MUL( Fs_Hz_in, 3 ) ) { /* Fs_out : Fs_in = 3 : 4 */ - S->FIR_Fracs = 3; - S->FIR_Order = RESAMPLER_DOWN_ORDER_FIR0; - S->Coefs = silk_Resampler_3_4_COEFS; - } else if( silk_MUL( Fs_Hz_out, 3 ) == silk_MUL( Fs_Hz_in, 2 ) ) { /* Fs_out : Fs_in = 2 : 3 */ - S->FIR_Fracs = 2; - S->FIR_Order = RESAMPLER_DOWN_ORDER_FIR0; - S->Coefs = silk_Resampler_2_3_COEFS; - } else if( silk_MUL( Fs_Hz_out, 2 ) == Fs_Hz_in ) { /* Fs_out : Fs_in = 1 : 2 */ - S->FIR_Fracs = 1; - S->FIR_Order = RESAMPLER_DOWN_ORDER_FIR1; - S->Coefs = silk_Resampler_1_2_COEFS; - } else if( silk_MUL( Fs_Hz_out, 3 ) == Fs_Hz_in ) { /* Fs_out : Fs_in = 1 : 3 */ - S->FIR_Fracs = 1; - S->FIR_Order = RESAMPLER_DOWN_ORDER_FIR2; - S->Coefs = silk_Resampler_1_3_COEFS; - } else if( silk_MUL( Fs_Hz_out, 4 ) == Fs_Hz_in ) { /* Fs_out : Fs_in = 1 : 4 */ - S->FIR_Fracs = 1; - S->FIR_Order = RESAMPLER_DOWN_ORDER_FIR2; - S->Coefs = silk_Resampler_1_4_COEFS; - } else if( silk_MUL( Fs_Hz_out, 6 ) == Fs_Hz_in ) { /* Fs_out : Fs_in = 1 : 6 */ - S->FIR_Fracs = 1; - S->FIR_Order = RESAMPLER_DOWN_ORDER_FIR2; - S->Coefs = silk_Resampler_1_6_COEFS; - } else { - /* None available */ - silk_assert( 0 ); - return -1; - } - } else { - /* Input and output sampling rates are equal: copy */ - S->resampler_function = USE_silk_resampler_copy; - } - - /* Ratio of input/output samples */ - S->invRatio_Q16 = silk_LSHIFT32( silk_DIV32( silk_LSHIFT32( Fs_Hz_in, 14 + up2x ), Fs_Hz_out ), 2 ); - /* Make sure the ratio is rounded up */ - while( silk_SMULWW( S->invRatio_Q16, Fs_Hz_out ) < silk_LSHIFT32( Fs_Hz_in, up2x ) ) { - S->invRatio_Q16++; - } - - return 0; -} - -/* Resampler: convert from one sampling rate to another */ -/* Input and output sampling rate are at most 48000 Hz */ -opus_int silk_resampler( - silk_resampler_state_struct *S, /* I/O Resampler state */ - opus_int16 out[], /* O Output signal */ - const opus_int16 in[], /* I Input signal */ - opus_int32 inLen /* I Number of input samples */ -) -{ - opus_int nSamples; - - /* Need at least 1 ms of input data */ - silk_assert( inLen >= S->Fs_in_kHz ); - /* Delay can't exceed the 1 ms of buffering */ - silk_assert( S->inputDelay <= S->Fs_in_kHz ); - - nSamples = S->Fs_in_kHz - S->inputDelay; - - /* Copy to delay buffer */ - silk_memcpy( &S->delayBuf[ S->inputDelay ], in, nSamples * sizeof( opus_int16 ) ); - - switch( S->resampler_function ) { - case USE_silk_resampler_private_up2_HQ_wrapper: - silk_resampler_private_up2_HQ_wrapper( S, out, S->delayBuf, S->Fs_in_kHz ); - silk_resampler_private_up2_HQ_wrapper( S, &out[ S->Fs_out_kHz ], &in[ nSamples ], inLen - S->Fs_in_kHz ); - break; - case USE_silk_resampler_private_IIR_FIR: - silk_resampler_private_IIR_FIR( S, out, S->delayBuf, S->Fs_in_kHz ); - silk_resampler_private_IIR_FIR( S, &out[ S->Fs_out_kHz ], &in[ nSamples ], inLen - S->Fs_in_kHz ); - break; - case USE_silk_resampler_private_down_FIR: - silk_resampler_private_down_FIR( S, out, S->delayBuf, S->Fs_in_kHz ); - silk_resampler_private_down_FIR( S, &out[ S->Fs_out_kHz ], &in[ nSamples ], inLen - S->Fs_in_kHz ); - break; - default: - silk_memcpy( out, S->delayBuf, S->Fs_in_kHz * sizeof( opus_int16 ) ); - silk_memcpy( &out[ S->Fs_out_kHz ], &in[ nSamples ], ( inLen - S->Fs_in_kHz ) * sizeof( opus_int16 ) ); - } - - /* Copy to delay buffer */ - silk_memcpy( S->delayBuf, &in[ inLen - S->inputDelay ], S->inputDelay * sizeof( opus_int16 ) ); - - return 0; -} |